Police Confirm Dylan McDermott's Mother Was Murdered 45 Years Ago

June 25th, 2012 4:00pm EDT

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Police have determined that Dylan McDermott's mother was murdered 45 years ago. Diane McDermott was shot in Waterbury, Connecticut, in 1967 when the actor was just five years old. Her death was originally ruled an accident.

After the actor approached detectives with lingering questions about her death last year, police reopened the case and launched a new investigation. According to local newspaper Republican-American, investigators discovered that Diane was killed by her gangster boyfriend John Sponza, who was found dead in the trunk of a car in a Massachusetts grocery store parking lot in 1972.